在Windows上从C中检测32/64位Java

我想知道在用户计算机上安装的Java运行时是否支持32位和64位，而且我想从C中执行此操作。我曾经想过，像下面这样的事情可以做到这一点：

检测64位的java：

int f=0 char *path = (char*) malloc(32768); char out[1035]; FILE *fp; if(f) fprintf(f,"Checking if 64-bit Java is available via the java command\n"); java64ok = 1; strcpy(path,"java -d64 -version 2>&1"); fp = _popen(path, "r"); if (fp == NULL) { if(f) fprintf(f,"Failed to run command\n" ); } if(fgets(out, sizeof(out), fp) != NULL){ if(strncmp(out,"Error",5)==0){ java64ok = 0; } while (fgets(out, sizeof(out), fp) != NULL) {} } if (feof(fp)){ pclose( fp ); } else{ if(f) fprintf(f, "Error: Failed to read the pipe to the end.\n"); } 

检测32位Java：

 if(f) fprintf(f,"Checking if 32-bit Java is available via the java command\n"); java32ok = 1; strcpy(path,"java -d32 -version 2>&1"); fp = _popen(path, "r"); if (fp == NULL) { if(f) fprintf(f,"Failed to run command\n" ); } if(fgets(out, sizeof(out), fp) != NULL){ if(strncmp(out,"Error",5)==0){ java32ok = 0; } while (fgets(out, sizeof(out), fp) != NULL) {} } if (feof(fp)){ pclose( fp ); } else{ if(f) fprintf(f, "Error: Failed to read the pipe to the end.\n"); } 

不幸的是，如果用户正在运行一个64位系统，那么如果C代码被编译为一个32位可执行文件，那么只检测到32位Java，如果程序被编译为64位程序。

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 public class Bitness { public static void main(String... ignored) { System.out.println(is64Bit() ? "64" : "32"); } private static boolean is64Bit0() { String systemProp; systemProp = System.getProperty("com.ibm.vm.bitmode"); if (systemProp != null) { return "64".equals(systemProp); } systemProp = System.getProperty("sun.arch.data.model"); if (systemProp != null) { return "64".equals(systemProp); } systemProp = System.getProperty("java.vm.version"); return systemProp != null && systemProp.contains("_64"); } }